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Control apparatus for internal combustion engine, method of controlling internal combustion engine, and computer-readable storage medium

a control apparatus and internal combustion engine technology, applied in the direction of electrical control, process and machine control, instruments, etc., can solve the problem of instantaneous interruption of the internal pressure signal of the cylinder

Active Publication Date: 2015-12-01
HONDA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a control apparatus, method, and computer-readable storage medium for an internal combustion engine that can detect and control the pressure in the engine's combustion chamber. This is achieved by integrating a cylinder internal pressure sensor with a fuel injection valve and using a fuel injection parameter calculator to calculate the opening time and start time of the valve based on the engine's operation state. The driving device then drives the valve in accordance with the calculated opening time and start time. During the process, a noise reduction period is set to reduce the noise caused by the valve's opening, and a cylinder internal pressure detection signal is generated based on the pressure detected during this period. The technical effect of the invention is to improve engine performance and efficiency through precise control of the combustion chamber pressure.

Problems solved by technology

The instantaneous interruption of the cylinder internal pressure signal is considered to occur due to activation of an engine when an output terminal of the cylinder internal pressure sensor is corroded or abraded.

Method used

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  • Control apparatus for internal combustion engine, method of controlling internal combustion engine, and computer-readable storage medium
  • Control apparatus for internal combustion engine, method of controlling internal combustion engine, and computer-readable storage medium
  • Control apparatus for internal combustion engine, method of controlling internal combustion engine, and computer-readable storage medium

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Experimental program
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Effect test

first modification

[0064]The previous value replacement process in Step S53 in FIG. 9 may be replaced with an estimated motoring pressure replacement process described below.

[0065]In the estimated motoring pressure replacement process, an estimated motoring pressure PCYLME is calculated by using a technique disclosed in Japanese Patent Application No. 4241581, the entire contents of which are incorporated herein by reference and which is applied by the applicant of the present disclosure, and the cylinder internal pressure signal after the noise reduction PCNR during the noise reduction period CAPNR is set to the estimated motoring pressure PCYLME calculated before one combustion cycle if the noise reduction period CAPNR includes the cylinder internal pressure increasing period CAPPUP. The estimated motoring pressure PCYLME is calculated for every certain crank angle and is stored in the RAM 16.

[0066]According to the technique disclosed in Japanese Patent Application No. 4241581, the estimated motorin...

second modification

[0070]The previous value replacement process in Step S53 in FIG. 9 may be replaced with a motoring waveform ε filter process described below.

[0071]In the motoring waveform ε filter process, the cylinder internal pressure signal after the noise reduction PCNR is set to the cylinder internal pressure sensor output signal PCYL (Equation (22) described below) if Equation (21) described below is established and is set to a motoring waveform value PCYLM (Equation (23) described below) if Equation (21) is not established (that is, PCYLPCYLM+ε). The motoring waveform value PCYLM is the value of the cylinder internal pressure sensor output signal during a fuel cutting operation. The “estimated motoring pressure PCYLME calculated before one combustion cycle” described in First modification may be used as the motoring waveform value PCYLM.

PCYLM−βPCYL≦PCYLM+ε  (21)

PCNR=PCYL  (22)

PCNR=PCYLM  (23)

[0072]FIG. 10 is a graph in which a waveform (hereinafter referred to as a “motoring waveform”) of th...

third modification

[0074]The previous value replacement process in Step S53 in FIG. 9 may be replaced with a linear interpolation process described below.

[0075]In the linear interpolation operation, a cylinder internal pressure sensor output signal value PCYLNS at the noise reduction start time CANS and a cylinder internal pressure sensor output signal value PCYLNE at the noise reduction end time CANE are applied to Equation (31) described below to calculate a cylinder internal pressure signal after the noise reduction PCNR(i) (i: index parameter):

PCNR(i)=PCYLNS+(PCYLNE-PCYLNS)×(i-iNRS) / (iNRE-iNRS)  (31)

[0076]In Equation (31), iNRS and iNRE are index parameter values corresponding to the noise reduction start time CANS and the noise reduction end time CANE, respectively.

[0077]Since the cylinder internal pressure sensor output signal PCYL does not greatly vary during the pressure increasing period if there is no effect of the fuel injection noise, the linear interpolation operation allows the fuel inje...

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Abstract

A control apparatus for an internal combustion engine includes a cylinder internal pressure sensor, a fuel injection parameter calculator, a driving device, and a sensor output signal processing device. The sensor output signal processing device is configured to set a noise reduction period in accordance with an opening time and an opening start time of a fuel injection valve and is configured to reduce, during the noise reduction period, noise that is included in a cylinder internal pressure sensor output signal and that is caused by opening of the fuel injection valve.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application claims priority under 35 U.S.C. §119 to Japanese Patent Application No. 2012-138175, filed Jun. 19, 2012, entitled “Control Apparatus for Internal Combustion Engine.” The contents of this application are incorporated herein by reference in their entirety.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present disclosure relates to a control apparatus for an internal combustion engine, a method of controlling the internal combustion engine, and a computer-readable storage medium.[0004]2. Discussion of the Background[0005]Japanese Unexamined Patent Application Publication No. 2010-285870 discloses a control apparatus that detects instantaneous interruption in which a cylinder internal pressure signal detected by a cylinder internal pressure sensor instantaneously disappears and that, when the instantaneous interruption frequently occurs, stops control of a fuel injection period based on the cylind...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): F02D41/30F02D35/02F02D41/14F02D41/28
CPCF02D41/3005F02D35/023F02D2041/286F02D2041/281F02D2041/1432
Inventor AKAZAKI, SHUSUKEYAMAMOTO, YUJIFURUHASHI, SATOSHI
Owner HONDA MOTOR CO LTD